gefran 650 User Manual

80208G_MHW_650-1250-1350_01-2017_ENG
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4. CONFIGURATION
4.11.5. n.S.x - Method for applying hysteresis
Acronym Scrolling message Submenu Attributes
n.S.x NORMAL/SYMMETRIC DEFINITION ALARM R W
The parameter shows and sets the method for applying hysteresis for alarm number “x” with respect to the alarm limit
value.
With normal, hysteresis is added to / subtracted from the alarm limit(s) based on the general alarm configuration. With
symmetrical, hysteresis is added to / subtracted from the alarm limit itself. For a detailed explanation of the difference
between normal and symmetrical, see paragraph “5.6.1. Generic alarms AL1...AL4” on page 142.
Unit of measurement: -
Options: NORML = Normal alarm
SYMMT = Symmetrical alarm (window)
4.11.6. PWON.E - Disabling the alarm at power-on
Acronym Scrolling message Submenu Attributes
PWON.E DISABLE AT SWITCH ON ALARM R W
The parameter shows and sets the behavior of the alarm (being configured) when the controller is powered on.
If the parameter is “OFF,” the alarm will trip when the controller is powered on if the process variable exceeds the alarm
setpoint limits.
If the parameter is “On,” the alarm will not trip until the alarm limit value is reached at least once after the controller is
powered on.
ATTENTION! The setpoint can be reached in increment or in decrement, or it may never be reached. Therefore, with “On”
the alarm might never trip even if the value of the process variable exceeds the alarm setpoint limits.
Example – Minimum, inverse and absolute alarm
When the system is off, the process variable equals room temperature (20 °C). The alarm setpoint is set at 150°C ± 10°C.
The controller powers on with the system.
So with “OFF” the alarm trips as soon as the controller is powered on because the temperature of the process variable
exceeds the alarm setpoint limits.
Instead, with “On” the alarm trips only after the temperature of 150°C is reached at least once for the process variable.
Unit of measurement: -
Options: OFF = Alarm enabled at power-on
On = Alarm disabled at power-on (until setpoint is reached)
4.11.7. LATCH - Memorizing the alarm
Acronym Scrolling message Submenu Attributes
LATCH MEMORY DEFINITION ALARM R W
The parameter shows and sets enabling of memorization of the alarm being configured.
Memorization maintains the active alarm state even after the alarm conditions are eliminated.
The alarm state can be deleted by from the digital input, serial input, or key.
Unit of measurement: -
Options: OFF = Alarm not latched
On = Alarm latched

gefran 650 Specifications

General

Brand	gefran
Model	650
Category	Temperature Controller
Language	English